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Recently, I'm researching the references about the Lord's Day in ancient christian writings, and had some doubts about the greek expression.
In Revelation 1:10, the day is called kuriakn nmera, in other word's, Lord's day, employing the word kuriakos, wich is defined by Strong as an adjective.
http://cf.blueletterbible.org/lang/lexi ... ersion=kjv

In Didache, chapter 14, the author uses the expression kuriakn de kuriou, that would be "Lord's Lord's". I don't understand this use, and it seems that the translators translate this expression as "the Lord's Day" too. Somebody knows what it means?
Greek version of Didache: http://www.ccel.org/ccel/lake/fathers2.v.html

Re: The Sabbath Day, couldn't mean the literal Sunday,because it's another day on the other side of the earth.So it began as a Jewish Sabbath Day in Israel, but now the Sunday "Sabbath Day" memorial is world-wide,

Sunday's a memorial of the Genesis seventh day of Rest, and of the original Easter Sunday rsurrection day. Sunday is also a type of day of entering into His Spiritual Rest.

But when John on the Isle of Patmos was "caught up"into that heavenly realm, and was then "in the Spirit on the Lord's Day," it was no one particular "day" but covered a span oftwo years in which he, inspired of God, wrote down all he saw,for the Book of Revelation.